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As the West scrambles for a diplomatic solution to the crisis in Crimea, Ukraine, they know that as they try and negotiate with Russian President, Vladimir Putin, he holds one of the aces in the pack: Russian gas supplies to the west.

Western diplomatic options are limited because oil and gas are at the center of Europe’s commercial ties with Russia. Although Europe has been trying to wean itself off Russian gas for the last decade, it is still reliant on Russia.

As one British commentator wrote today: “Moscow has its thumb on our economic throat.”

Estimates vary, but some 25-30 percent of European gas comes from Russia, with about half that transiting through Ukraine. Just how dependent Europe is can be seen from the graph, which is from Morgan Stanley:

Although still strategically important, Ukraine is less important than in the past, with other pipeline routes via the Baltic Sea or Belarus and Poland being options.

There are already signs that the Russian government, which has a history of using gas exports as an economic lever, is threatening the Ukrainians with higher gas prices.

Mikhail Korchemkin, head of Pennsylvania-based East European Gas Analysis told Bloombergthat “gas debt is a traditional Russian move to pressure Ukraine. In the past decade the Kremlin used the gas tap as a tool of political pressure on the former Soviet republics.”

And this threat is already pushing up prices. In recent days, oil prices have climbed $2-$3 a barrel. The escalating conflict has already pushed the price of gas futures up 10 percent in early trading this morning, while the benchmark price for oil rose by more than two percent.

Many political analysts are arguing that Germany is the central diplomatic player in the crisis, but its hands are effectively tied due to its reliance on Russian gas. The country is Europe’s biggest gas consumer and Russia’s largest customer.

The only good news is that spring is fast approaching after a particularly mild winter, so European gas reserves are said to be high.

Meanwhile, the British position seems to be pretty hypocritical too. Whilst warning that there would be significant costs and consequences to the Russians for their actions, leaked documents reveal that that the British negotiating position should be that “London’s financial centre” should not be closed to Russian businesses, including oil and gas companies.

With impeccable timing, on Monday, Gazprom held its annual meeting in London. And at the weekend, the London Mayor hosted a Russian Maslenitsa or pancake festival whose lead sponsor was Rosnfeft, the vast Russian oil drilling company.

The bottom line is—despite the dire warnings of consequences for Russian by western politicians—the continent is still addicted to Russian gas, so any draconian sanctions or effective political action remains highly unlikely.